Re: [Qemu-devel] [PATCH v2 2/8] tests/qemu-iotests/005: Add a sanity check for large sparse file support

[Eric Blake <eblake@redhat.com>]

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On 5/1/19 6:08 AM, Alex Bennée wrote:
> 
> Thomas Huth <thuth@redhat.com> writes:
> 
>> "check -raw 005" fails when running on ext4 filesystems - these do not
>> support such large sparse files. Use the same check as in test 220 to
>> skip the test in this case.
>>
>> Suggested-by: Eric Blake <eblake@redhat.com>
>> Signed-off-by: Thomas Huth <thuth@redhat.com>
>> ---
>>  tests/qemu-iotests/005 | 9 +++++++++
>>  1 file changed, 9 insertions(+)
>>
>> diff --git a/tests/qemu-iotests/005 b/tests/qemu-iotests/005
>> index 2fef63af88..6136ced5c8 100755
>> --- a/tests/qemu-iotests/005
>> +++ b/tests/qemu-iotests/005
>> @@ -55,6 +55,15 @@ if [ "$IMGPROTO" = "sheepdog" ]; then
>>      _notrun "image protocol $IMGPROTO does not support large image sizes"
>>  fi
>>
>> +# Sanity check: For raw, we require a file system that permits the creation
>> +# of a HUGE (but very sparse) file.  tmpfs works, ext4 does not.
> 
> Is this comment correct? Running on my ext4 home partition this test
> seems to be running fine and not skipping. Indeed:

>> +if [ "$IMGFMT" = "raw" ]; then
>> +    if ! truncate --size=5T "$TEST_IMG"; then

5T fits on ext4 but not ext3. This is not a straight copy from 220
(where the size in question was even bigger, at 513T), so the comment is
indeed slightly inaccurate; it may be worth figuring out which file
system actually failed to update the comment. But the code change is
correct once the comments are fixed.

Reviewed-by: Eric Blake <eblake@redhat.com>

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org


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